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titanium dioxide in wax
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Copic markers are alcohol-based and known for their blendability and vibrancy on various surfaces. When it comes to using them on pigment ink, the key factor is the ink's drying time and formulation. Pigment ink is generally slower to dry and sits on top of the paper compared to dye inks that are absorbed. If the pigment ink is not completely dry or is not formulated to be alcohol-marker resistant, Copics can cause it to blur or smudge. To avoid this, ensure the pigment ink is fully dry, which might take longer than usual, or heat set it to speed up the process. Additionally, testing on a scrap piece of paper before applying it to your final artwork can help prevent unwanted smudging. Some pigment inks are designed to be compatible with alcohol markers, so looking for those options might be beneficial.
Caustic soda, also known as sodium hydroxide (NaOH), plays a crucial role in the tie-dye process, especially when working with natural fibers like cotton. Its main function is to prepare the fabric for better dye absorption. In a process called "mercerization," caustic soda swells the fibers, making them more receptive to dyes by altering their structural properties. This not only enables the dye to penetrate more deeply and evenly, result in more vibrant and lasting colors but also increases the fabric's luster and strength. However, due to its corrosive nature, caution and protective gear are advised when handling caustic soda. It's essential to rinse the treated fabric thoroughly before applying dyes to ensure safety and achieve the desired dye effects.
Injection molding process engineering is a critical field in manufacturing, focusing on creating components by injecting molten material into a mold. In interviews, candidates may be asked about their experience with different materials (such as plastics, metals, silicones), their understanding of machine settings (e.g., temperature, pressure, cooling times), and how they troubleshoot common injection molding issues (like short shots, flash, warping, or sink marks). Questions may also explore their knowledge of mold design principles, familiarity with CAD software, and experience with statistical process control (SPC) or lean manufacturing techniques to optimize production efficiency and quality. An ideal candidate should demonstrate a detailed understanding of the injection molding process, from material selection to finished product, showing how they've applied theory to practical challenges in past roles.
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